Historical records for Quercus margarettae exist for New York, but no current population is known there.

Populations of post oak in east Texas (the Cross Timbers region) on sands and gravels exhibit characteristics somewhat intermediate between Quercus stellata and Q . margarettae ; most of the trees at those localities have leaves with abaxial surface similar to Q . margarettae , leaf shape more similar to Q . stellata , and twigs somewhat intermediate between the two species in diameter and varying from tightly pubescent to glabrate. Acorn characters tend toward Q . margarettae as well. These populations have been treated as Q . drummondii Liebmann, the Drummond post oak. Similar intermediates occur sporadically throughout the range of the post oaks in southeastern United States, but they do not form such continuous and morphologically stable populations; perhaps the Texas material is best treated as a nothospecies, Q . × drummondii .